Juvenile Dorado Aggression Question

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Flip side could be temp or diet too......

I'm assuming the Brassies swim side by side with Falkneri rays in he wild, and the Falks are supposed to be comfy down to 65 degrees. Most Potomotrygons aren't going to appreciate these temps.

Diet may have a heavy influence as well. "Blue" Motoros come in with crazy nice blue hues, they all loose this soon after captivity, and pretty sure the offspring never show this blue hue.

I'm hoping that the big difference between the 2 Dorado species is temperament. "Goldness" isn't half as big of a deal as having a Dorado that won't rip a tank apart. :)
 
DB junkie said:
I'm hoping that the big difference between the 2 Dorado species is temperament. "Goldness" isn't half as big of a deal as having a Dorado that won't rip a tank apart. :)
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God isn't that the truth! LOL

Picking through problems like this us what keeps the hobby fresh for me. I love that I makes me think.

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Chicxulub said:
God isn't that the truth! LOL

Picking through problems like this us what keeps the hobby fresh for me. I love that I makes me think.

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That's half the reason I'm still here, and most of the reason I won't be going anywhere...... Keeps the mind in shape.

All I know is I can only remember ever seeing decent sized Dorados living together without being ripped up in Triggeraa's tank. My 2 Brassies are also living in harmony, no nips, tattered fins or missing scales and swim side by side. IF my hunch is correct then no Frankies have ever been cohabbed without the expense of one being beat up, and this would be the 2nd case of Brassies working....... :)
 
Poop. Guess my hunch is out the window... lol

Why does it seem like every Dorado I see pics of seems to have the fin hook indicating it's a male?

Boy, anyone who can honestly say those aren't beautiful fish when they get big needs to change their meds..... Crazy sweet fish.
 
DB junkie said:
Poop. Guess my hunch is out the window... lol

Why does it seem like every Dorado I see pics of seems to have the fin hook indicating it's a male?

Boy, anyone who can honestly say those aren't beautiful fish when they get big needs to change their meds..... Crazy sweet fish.
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Yeah me too, I don't think the fin hook indicates anything either mine is only 3 inches and has a hook when they're supposed to mature at 15 inches... Seems like they all have it... Maybe if someone could get in touch with an aquacultural place in Brazil they can tell us how to differentiate btwn the sexes because they breed them.

Yes I was actually quite hesitant to get one due to their lack of feeding action in YouTube vids, but dang everything you and other people say about them, they def don't disappoint!!!!


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crenicichla444 said:
Yeah me too, I don't think the fin hook indicates anything either mine is only 3 inches and has a hook when they're supposed to mature at 15 inches... Seems like they all have it... Maybe if someone could get in touch with an aquacultural place in Brazil they can tell us how to differentiate btwn the sexes because they breed them.

Yes I was actually quite hesitant to get one due to their lack of feeding action in YouTube vids, but dang everything you and other people say about them, they def don't disappoint!!!!


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Give them frog! lol. Once they get used to eating them it can get pretty crazy......
 
Yeah I saw your vids of frogging! I bred some bullfrogs back in the day, might do it again when my guy gets big.

Oh and Btws one really cool thing I noticed about these guys, I was growing out another fish inthe same tank and had a divider because I don't trust the dorado. once I moved the fish and took out the divider the dorado wasn't used to the extra space, and wouldn't venture past that point when doing laps for a week... Pretty cool eh? Very aware of tank boundaries


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Clarification on the hook:

The hook on a male vs a female is only really obvious when the fin is fully erect. A female with a relaxed anal fin-- the ones in the pics just posted are convenient and clear examples of relaxed fins-- might look somewhat hooked. You'll notice that in the picture of the dimorphism in the sticky that the female's anal fin is significantly longer anteriorly. When folded down, this would look "hooked".

Please also note that this trait isn't something I made up, it is a well documented trait of the South American characidae. The primary reference in the sticky dated 2009 that described frankies as a new species elaborated on this in detail.

Edit- where I on the laptop, I'd use one of those pics to illustrate what I'm taking about, but alas I'm not. Maybe later, depending on the teething one year old...

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I've caught S. brasiliensis all over Uruguay and in lots of different conditions: In the Rio Uruguay (big, cool, swift river separating Argentina and Uruguay), small ponds, streams...even a semi-brackish pond right next to the Atlantic (Laguna del Diario). I've caught fish ranging from 2-3" to 2.5'...and they're all shades of metallic colors...they're quite common and widely distributed.

Water in Uruguay tends to be neutral to slightly alkaline and moderately hard. I'm sure it varies a bit but the fish are pretty adaptable.

The big difference between the tropical Amazon and Uruguay is the temperature and temperature range. Uruguay (and the equivalent distance from the equator in Argentina) are decidedly sub-tropical. Temps in Southern Uruguay are cold in the winter: 40s and 50s. These fish love it!

Matt

Chicxulub said:
Well to be fair, adult wild caught members of both brasiliensis and franciscanus tend to be very yellow. I've not noticed a real difference in the color of the two.

A valid hypothesis could be native water quality as the two species come from different drainages. Frankies come from the tropical Amazon basin while the brassy is from various basins to the somewhat more temperate south.

I don't know off hand what the water quality is like in Uruguay and the surrounding regions, but there is a chance that it could be a good bit harder than the Amazon basin.

This would explain why your brassy colored up a bit better, he's comfortable in your liquid rock whilst the frankie's are somewhat stressed.

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